style.css

body {
    font-family: Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
}

hr {
    width: 80%;
    margin: 5px;
}

.card-header {
    width: 100%;
    margin-bottom: 8px;
    text-align: center;
}

.card-header-title {
    font-size: 300%;
    color: black;
    width: 100%;
}

.card-row {
    display: flex;
    flex-direction: row;
    justify-content: center;
}

.card-body {
    background-color: red;
    background-image: linear-gradient(45deg, white 25%, transparent 25.5%, transparent 50%, white 50.5%, white 75%, transparent 75.5%, transparent);
    background-size: 20px 20px;
    padding: 8px;
}

.card-column {
    display: flex;
    flex: 1;
    flex-direction: column;
    border: solid thin grey;
    height: 110px;
    margin: 5px;
    padding: 2px;
    box-shadow: 4px 4px grey;
    border-radius: 5px;
    font-size: 135%;
    vertical-align: middle;
    text-align: center;
    justify-content: center;
    align-items: center;
    background-color: white;
}